The man accused of killing 77 people in a bomb-and-gun rampage in Norway last summer admitted Monday that he had committed the acts but said he was not guilty.

"I acknowledge the acts but do not plead guilty, and I claim I was doing it in self-defense," Anders Behring Breivik told a court in Oslo, Norway. The court recorded a plea of not guilty for him.

Breivik's trial, which began Monday, is expected to last up to 10 weeks. If convicted, the court will base his punishment on a determination of his sanity. It may not be possible for him to receive the maximum punishment, if he is deemed insane.

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